Weapons
Guns, grenade, spade, and blocks.

Sights / Scopes
Crosshair for aiming.

Skins
Player model arms, legs, head, torso, and corpse.

Sounds
Gunfire, footsteps, explosions, intro music, etc.

Splash Screens
The image that is displayed when the game client opens.

Miscellaneous
Control point, intel, icons, tracers, and other uncategorized objects.

Packs
Organized combos of complementary weapons, scopes, skins, sounds, etc.